Method of lining shafts with concrete.



E. MORLAB.

METHOD 0E LNING SHAETE WITH CONCRETE.

APPLICATION FILED NOV. 5, 1912.

Patented Mar. 10, 1914.

Infue nor. Edward JMQZZQQ,

EDWARD MORLAE, OF SAN GABRIEL, CALIFORNIA.

METHOD 0F LINING SHAFTS 'WITH CONCRETE.

Specication of Letters Patent.

Patented Mar. 10, 1914.

Application filed November 5, 1912. Serial No. 729,557.

To all whom it may concern:

Be it known that I, EDWARD MORLAE, a citizen of the United States,residing at San Gabriel, in the co-unty of Los Angeles and State ofCalifornia, have invented a new and useful Improvement in Methods ofLining Shafts with Concrete, of which the following is a specification.

This invention relates to a method of lining shafts with concrete, andthe principal object of the invention is to provide a method toeliminate the building of elaborate retaining walls in a well shaft.

It is also an object to provide a method by which the concrete may beinserted in sections progressively from the top or ground leveldownward.

In the drawings accompanying this specification Figure l is a centrallongitudinal section of a shaft showing two of the sections of concreteintroduced, and the form in position ready to place the next succeedingsection of the lining. Fig. 2 is a cross section on the line 2-2 of Fig.l, viewed in the direction indicated by the arrows. Fig. 3 is a crosssection of the shaft on the line 33 o Fig. l, viewed in the directionindicated e arrows. Fig. 4 is a detail section on the line #lc-4. ofFig. 3, viewed in the direction indicated by the arrows.

Heretofore in the lining of shafts with concrete, as far as known to me,the shaft has first been sunk or dug the required depth, requiring' atemporary lining to retain the walls of the shaft intact and preventcaving in upon the operators. Then this supporting lining either has tobe removed or becomes a loss by being left in the shaft while the formsare inserted and the lining introduced from the bottom upward, theentrance of water in the lower end of the shaft or intermediatepositions complicating this process.

' This invention overcomes the above difliculties by providing a methodby which the shaft is inclosed with the permanent lining as the workprogresses downward without great delay, and materially reducing thecost, and increasing the efliciency of the structure.

In the drawings numerals are used to designate the same parts in thedifferent views, 5 designating the surface of the ground, and 6 theshaft vertically dug therein by any suitable means or apparatus, themethod preferably used being to dig the shaft a depth equal to the hightof the collapsible form preferably used. ln practice this form is aboutsiX feet in length, depending on the character of the soil through whichthe shaft is being sunk. The section dug is preferably as indicated, inthe lower portion of Fig. l, so as to provide the platform 7 of adiameter equal to the diameter of the finished shaft, from this pointdownwardly and outwardly, being excavated to leave the inclined face 8until the concentric periphery of the major diameter of the shaft is M0n this platform 7 the collapsible form l0 is erected, the upper fallsslightly below the inner edge ll of a previously formed section. Theform l0 is preferably formed of a plurality of vertical sections 12 eachof which is provided with a flange le secured thereto at suitabledistances, the flanges, when various sections are placed adjacent oneanother abutting to form the circular configuration or cylinder, uponwhich flanges are supported the four sections of the rim 15 which areheld together by suitable means. as pins 16 the locking plate 17' toofthe locking plates 17. One of these sections is necessarily cut away asindicated in dotted lines at 19 so that this section may be removed toallowthe collapse of the form after the concrete has been inserted.

As before stated, the concrete is introduced between the upper edge 20of the form and the lower inner edge 1l of the previously formed sectionof the concrete lining which is preferably reinforced by the verticalrods 2l supported in any well known manner. This upper edge 20preferably extends a slight distance above the lower edge 22 of the lastsection of the concrete lining.

rThe shaft is preferably dug during the day the required depth, then theprocess of tamping the concrete lining in place is performed, and theconcrete left to cure over night, while the digger is otherwise occud.The concrete sufficiently sets to permit the removal of the forms thenext morning, and the shaft is sunk the corresponding distance onlylimited by the length of the form used. The triangular space Q3 isfilled either before the removal of the form and troweled in position,or inserted afterward, as may be found preferable.

and sinking the In an excavation having a lining of this character, thecostover usual constructions has been reduced approximately one-half,together with the material increase in speed of construction, and withgreater assurances of safety, the irregular' portions of the shaft wallsfirmly grasping the concrete sections, and preventing sliding as well asthe connection to one another by adhesion, or suitable connectionsbetween the reinforcing rods.

What l claim is:

1. Al method of lining shafts with vconcrete, consisting in sinking ashaft approximately equal to the depth of the form used, an annularchannel being fo-rmed below a flat base for vthe form, inserting theform to rest on'the base, and filling in cement, then removing the formand sinking` the shaft another section and placing the form to fill inbelowy the last formed section.

" 2. A method of lining shafts with concrete, VconsistingY in sinking ashaft equal to the depth of a form, inserting the form, and lling lincement, then' removing the form shaft another section and placing the''form to lill in below the last formed section, then facing the insideof the casing intermediate of the flat top of the new section and theinclined edge of the section'next above.

3. A method of lining shafts, which consists in rst excavating a portionof the shaft approximately equal to the height of the form employed, thebottom of the shaft being formed as a truncated cone, the truncationforming a base for the form, then inserting the form of smaller diameterand filling the void between the wall of the shaft vand the form withconcrete and allowing the E. MORLAE.

Witnesses z EDMUND A. STRAUSE, EARLE R. PoLnARD.

Copies o! this patent may be obtained for nve cents each, by addressingthe Commissioner ot Patents,

Washington, '.D. C.

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